Sujet : Re: The Circles
De : chris.m.thomasson.1 (at) *nospam* gmail.com (Chris M. Thomasson)
Groupes : sci.mathDate : 01. Jul 2025, 20:23:15
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <1041cj3$30u9b$1@dont-email.me>
References : 1 2 3 4
User-Agent : Mozilla Thunderbird
On 7/1/2025 4:29 AM, sobriquet wrote:
Op 01/07/2025 om 07:16 schreef Ross Finlayson:
On 06/30/2025 11:29 AM, Chris M. Thomasson wrote:
On 6/28/2025 8:38 PM, Ross Finlayson wrote:
Oh, been a while, figure I'll post.
[...]
>
An ellipse is nothing more than a circle projected in 3d? ;^)
>
>
That's frivolous.
>
An ellipse is constructible from a loop of string and two pegs.
>
An image of a circle onto a plane as projected from
an incident angle via 3D: is not an ellipse, either.
>
Ask your shadow.
>
>
Looks like an ellipse to me:
https://www.desmos.com/3d/syqqdp9cef?translucentSurfaces
:^)
An ellipse, take a parametric circle and use different x and y radii in the 2d plane. However, Think of rotating a circle in a 3d projection. It visually looks like an ellipse. So, I always found that interesting. If I take an ellipse in 2d, it has a rotated circle "counterpart" in 3d? Fair enough, kind of? ;^)
The Circles
Re: The Circles